Mechanical gas valve



NOV. 7, F TRUDWlG MECHANICAL GAS VALVE Filed Jan. 14, 1952 INVENTOR Z'Truduiy BY ATTORNEY W 7 from its lower face.

. munication is 40- Patented Nov. 7, 1933 untrue STATES PATENT orrie]: 1

1 Claim.

The main object of this invention is to prowhen the flame of a gas burner, or" which the valve forms a part, is extinguished.

Another object of the invention is to provide a gas valve which is mechanically closed as the flame is extinguished by a thermostat which is deflected by the flame emanating from a gas burner.

The above and other objects will become apparent in the description of the invention in which characters of reference refer to likenamed parts in the drawing.

Referring briefly to the drawing, Figure 1 is a longitudinal, sectional, elevational View through the gas burner, showing the piston in open position.

Figure 2 is a top-plan view of Figure 1.

Figure 3 is a front-elevational view of the gas burner and thermostat, showing the former in closed condition.

Figure 4 is an end elevational view of Figure 3.

Referring in detail to the drawing, the numeral indicates the bell at the outer end of a gas burner. Into the usual opening of the bell, the nipple 11 of the gas burner body 12 is inserted. This gas burner body has a nipple 11 and a second diametrically opposite nipple 13 integral therewith. These nipples 11 and 13 are provided with aligned channels 14 and 15 respectively. The body 12 is provided with a bore 16 which extends at right angles to the channels 14 and 15 and communicates there- 'with. This bore slidably receives a piston 17 which is provided intermediate its length with an annular recess 18 so that when the recess is aligned with the channels 14 and 15, comhad between these channels around the recess of the piston 17. To normal 131 retain the piston in closed position a shank 19 is formed on said piston and is surmounted by a head 20 which has a rim 21 extending Into the confines of this rim one end of a coil spring 22 is inserted. This coil spring is wound about the shank 19, and its opposite end rests upon the end of the valve body 12.

The lower end of the piston 17 is provided with a flange 23 from which depends a T arm 24. This T arm is engaged by the bifurcated end 25 of a bell crank 26. The intersection of the arm of the bell crank is pivoted upon the extremity of a bracket 27. The opposite arm of the bell crank 26 is hingedly connected to a mover rod 28 which is joined to. an car 29 in a pivoted manner. The ear 29 forms part of the thermostatic blades 30. These blades are secured at their upper ends to a bracket 31 which is secured to the gas burner in close proximity to a flame where the latter will effect the blades and deflect the same.

The piston 17 is preferably circular in crosssection, and when so constructed is provided with a runway 32. This runway 32 receives the projecting end of a pin 33 which is embedded in the bodylZ at its lower end. and projects into the bore 16 of said body.

The device is adapted to automatically close when the flame is extinguished. The gas burner not shown has a bracket 31 mounted thereon in a position where the blades of the thermostat member will be influenced by the flame. Normally the thermostatic blades are slightly curved as shown in Figure 3. To open the valve a push button 20 is depressed until the upper limits of the runway 32 receives the pin 33. The position of the piston 1'7 after being depressed has its annular recess 18 aligned with the channels 14 and 15 of the nipples 11 and 13 respectively. In this position with the finger upon the push button 20, the gas will flow from the source of supply, into which the nipple 13 is tapped, directly to the burner through the bell 10. Igniting the gas will cause the burner to flame and since this burner is placed in close proximity to the thermostatic blades 30 the latter will be deflected and will straighten to the position shown in Figure 4. This movemerit of the thermostatic blades will exert a pull upon the rod 28 thereby rotating the bell crank 26 whose bifurcated end 25 engaging the T arm 24 will retain the piston 1'7 in lowered position thereby retaining the valve in open condition.

Should a gust of wind or liquid extinguishthe flame the thermostat will immediately begin to deflect to its curved condition, and will thereby release the plunger 17, the spring 22 lar recess, aligned opposing channels in said valve body, a shank on said piston, a button surmounting said shank, a coil spring wound about said shank seated on said valve body and supporting said push button, said spring being adapted to lift said piston to a position Where said recess disaligns with said channels to close said valve, a thermostat located remote from said valve in close proximity to a flame, a bell crank pivoted on said valve body, a rod secured to said bell crank and thermostat for actuating said bell crank, said bell crank having" a'bi furcated end, an arm depending from said pistonv 

